摘要
蒙其古尔地区位于伊犁盆地南缘东部构造活动区与西部构造稳定区的过渡部位,中下侏罗统水西沟群是该区可地浸砂岩型铀矿床的成矿主岩,具有较好产铀前景。为深入了解该区砂体的岩石学特征,通过野外详细地质调查、钻孔观察、岩心编录等方法,结合室内工作和前人的研究成果,详细研究了该区砂岩的碎屑骨架组分、结构及成岩作用等岩石学方面的特征,并对其后生铀成矿和物源环境进行了综合分析。结果表明该区砂岩成分成熟度和结构成熟度均较低,成岩作用较强,具有发育铀储层的物质基础,其物源很可能是来自于周边的火山岩。
The Mengqiguer area lies between the tectonically active region in the east and stable region in the west of the Yili basin. The Shuixigou Group of Lower-Middle Jurassic is the uranium-hosting formation of in-situ leachable sandstone-type uranium deposits in this area. It has a fairly good prospect to explore uranium ore. In order to ascertain lithology characteristics of the Mengqiguer area, geological survey in the field, core observation and documentation have been conducted. In combination with indoor work and previous studies, the component of clastic grains, lithogenesis and structure of the Mengqiguer sandstones are studied in detail. Moreover,the epigenetic uranium mineralization and source area are also analyzed comprehensively. The result indicates that both the compositional maturity and the textural maturity of this sandstone are relatively low, and the diagenesis is intensive, providing a material basis for development of uranium reservoirs. Their sources likely originated from the surrounding volcanic rocks .
出处
《地质与勘探》
CAS
CSCD
北大核心
2012年第1期132-139,共8页
Geology and Exploration
基金
国家自然科学基金项目(编号:40972067)资助的成果
关键词
水西沟群
岩石学特征
蒙其古尔
伊犁盆地
Shuixigou Group, lithology characteristics, Mengqiguer, Yili basin
